Virtually the only fuel used by the brain, except during prolonged starvation, when these supplies are too low is
a. glucose
b. fructose
c. galactose
d. sucrose

In the water cycle , when does water undergo a chemical change

Which of these is true for bacteria because they are prokaryotic cells? a. they can engulf body cells in order to make memory cells. b. they must invade viruses in order to reproduce. c. they are much larger than eukaryotic body cells. d. they can reproduce on their own outside of other cells.

Which could be a pathway of food through an ecosystem